This project is a retrospective observational study based on the molecular characterization of a Spanish population of patients with refractory radio-iodine differentiated thyroid cancer (DTC) and medullary thyroid carcinoma (MTC) with advanced and / or metastatic disease undergoing systemic treatment, or under clinical observation. Three diagnostic techniques will be performed on formalin-fixed paraffin embedded (FFPE) tumor samples from the study population: immunohistochemistry (IHC), fluorescence by in situ hybridization (FISH) as well as Next-Generation Sequencing (NGS) techniques by means of DNA and RNA analysis (Ion Platform Torrent - Oncomine Focus Assay, 52 gene detection). The results of each patient will be compared in order to correlate the results of each method.
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Progression free survival (PFS)
Timeframe: Throughout the study. Approximately 2 years
Overall survival (OS)
Timeframe: Throughout the study. Approximately 2 years
Objective response rate
Timeframe: Throughout the study. Approximately 2 years
Prevalence of genetic alterations
Timeframe: Throughout the study. Approximately 2 years